90002220 has 288 divisors, whose sum is σ = 336462336. Its totient is φ = 17888640.

The previous prime is 90002219. The next prime is 90002279. The reversal of 90002220 is 2220009.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 90002220.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3913129 + ... + 3913151.

It is an arithmetic number, because the mean of its divisors is an integer number (1168272).

Almost surely, 2^90002220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90002220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168231168).

90002220 is an abundant number, since it is smaller than the sum of its proper divisors (246460116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90002220 is a wasteful number, since it uses less digits than its factorization.

90002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 90002220 is about 9486.9499840570. The cubic root of 90002220 is about 448.1441593360.

Adding to 90002220 its reverse (2220009), we get a palindrome (92222229).

The spelling of 90002220 in words is "ninety million, two thousand, two hundred twenty".